vice president joe biden met with china's president in beijing earlier today. the meeting was over china's new defense zone that is owned over him and that both japan and china claim to own. biden did not comment on the islands after the first meeting, but said that the chinese leader was candid and constructive. the two are set to meet later today. and a hong kong, look at pollution set to -- at toxic levels. an aging fleet of diesel buses and trucks combined with sunny, dry weather has caused pollution to spike in recent days in the city. speaking of smog, here is a building that eats it. in mexico city, this building can effectively consume the amount of smog produced by 1000 cars per day. it is how a city that was once the world's most polluted is cleaning itself up. ? >> in the city, online retail giant that post move from its headquarters to the center of town. it actually enjoyed something of a renaissance, creating a whole new community in the process. bloomberg checked it out. >> las vegas, always the town where fortunes are won and lost, but few are a